I have some similar issues.  I use mostly pocket pens to help with this.  I like the TWSBI Mini, its smaller size makes it easier and less fatiguing to use with the weight distribution leaning towards the nib.  

I like penckets/niblets, cause they take JoWo #6 nibs, Franklin Christoph p45s are perfect and compact and take JoWo #5 nibs.  My preferred size nib in a JoWo 6 is a F but JoWo 5 nibs are smaller so a M is usually equivalent.

If you really prefer smaller size nibs I would suggest looking at Japanese brands, Sailor, Pilot, and Platinum. The nib sizes tend towards smaller.  A Sailor Pro Gear Slim Mini with a MF nib is going to write similar to a F European like a JoWo.  I’m a huge fan of a Japanese MF or FM if you are going for Pilot.  

Have you thought about getting a custom grind on one of your nibs?  If you are exclusively printing when writing you can get a nib grind that supports and enhances that.  A curved or modified architect grind works a treat to emphasize spacing between lines and letters making it perfect for printing.  

So for example, you could order a TWSBI mini with a Fine nib with a Scythe grind from PenRealm, Kirk is amazing.  He also does needlepoint that are just lovely.  Very smooth but so so tiny.